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THE MAGELLANIC CLOUDS NEWSLETTER an Electronic Publication Dedicated to the Magellanic Clouds, and Astrophysical Phenomena Therein

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THE MAGELLANIC CLOUDS NEWSLETTER an Electronic Publication Dedicated to the Magellanic Clouds, and Astrophysical Phenomena Therein THE MAGELLANIC CLOUDS NEWSLETTER An electronic publication dedicated to the Magellanic Clouds, and astrophysical phenomena therein No. 114 — 1 December 2011 http://www.astro.keele.ac.uk/MCnews Editor: Jacco van Loon Figure 1: Model producing an object similar to SN 1987A (Zaninetti 2011; cf. MC News #113). 1 Editorial Dear Colleagues, It is my pleasure to present you the 114th issue of the Magellanic Clouds Newsletter. This edition is remarkably voluminous, with no less than five refereed papers on Cepheids alone, many papers on massive stars including Be stars and X-ray binaries and several directly resulting from the VLT-FLAMES and/or Tarantula surveys. Likewise there are a couple of papers resulting from the VISTA Magellanic Clouds survey, the overview of the SAGE-SMC Spitzer survey and some interstellar medium results arising from Herschel and HST-COS surveys as well as improved radio continuum data. There are some interesting papers on the reverse shock in SN 1987A and a likely supernova progenitor (Sanduleak’s star), too. Looking for a job? Check out the offers of postdoc positions in interstellar medium studies at STScI, or extra-galactic astrophysics at Toledo, both in the USA. If you are looking for meetings, then check out the announcements of one on the mass loss return from stars to galaxies at STScI (USA), and another one on circumstellar dynamics at the border of Brazil with Argentina. The next issue is planned to be distributed on the 1st of February 2012. With the best wishes for the holiday season and a Happy New Year, Editorially Yours, Jacco van Loon 2 Refereed Journal Papers Calibrating the Cepheid Period–Luminosity relation from the infrared surface brightness technique. II. The effect of metallicity, and the distance to the LMC Jesper Storm1, Wolfgang Gieren2, Pascal Fouqu´e3, Thomas G. Barnes4, Igor Soszy´nski5, Grzegorz Pietrzy´nski2,5, Nicolas Nardetto6 and Didier Queloz7 1Leibniz Institute for Astrophysics Potsdam (AIP), Germany 2Universidad de Concepci´on, Departamento Astronom´ıa, Chile 3IRAP, Univ. de Toulouse, CNRS, France 4Univ. of Texas, McDonald Observatory, USA 5Warsaw University Observatory, Poland 6Laboratoire Fizeau, UNS/OCA/CNRS UMR6525, Nice, France 7Observatoire Astronomique de l’Universit´ede Gen`eve, Switzerland The extragalactic distance scale builds directly on the Cepheid Period–Luminosity (PL) relation as delineated by the sample of Cepheids in the Large Magellanic Cloud (LMC). However, the LMC is a dwarf irregular galaxy, quite different from the massive spiral galaxies used for calibrating the extragalactic distance scale. Recent investigations suggest that not only the zero-point but also the slope of the Milky Way PL relation differ significantly from that of the LMC, casting doubts on the universality of the Cepheid PL relation. We want to make a differential comparison of the PL relations in the two galaxies by delineating the PL relations using the same method, the infrared surface brightness method (IRSB), and the same precepts. The IRSB method is a Baade–Wesselink type method to determine individual distances to Cepheids. We apply a newly revised calibration of the method as described in an accompanying paper (Paper I) to 36 LMC and five SMC Cepheids and delineate new PL relations in the V, I, J, & K bands as well as in the Wesenheit indices in the optical and near-IR. We present 509 new and accurate radial velocity measurements for a sample of 22 LMC Cepheids, enlarging our earlier sample of 14 stars to include 36 LMC Cepheids. The new calibration of the IRSB method is directly tied to the recent HST parallax measurements to ten Milky Way Cepheids, and we find a LMC barycenter distance modulus of 18.45 ± 0.04 (random error only) from the 36 individual LMC Cepheid distances. In the J, K bands we find identical slopes for the LMC and Milky Way PL relations and only a weak metallicity effect on the zero points (consistent with a zero effect), metal poor stars being fainter. In the optical we find the Milky Way slopes are slightly shallower than the LMC slopes (but again consistent with no difference in the slopes) and small effects on the zero points. However, the important Wesenheit index in V, (V − I) shows a metallicity effect on the slope and on the zero point which is likely to be significant. We find a significant metallicity −1 effect on the WV I index γ(WV I ) = −0.23 ± 0.10 mag dex as well as an effect on the slope. The K-band PL relation on the other hand is found to be an excellent extragalactic standard candle being metallicity insensitive in both slope and zero-point and at the same time being reddening insensitive and showing the least internal dispersion. Accepted for publication in Astronomy and Astrophysics Available from arXiv:1109.2016 3 The Baade–Wesselink p-factor applicable to LMC Cepheids N. Nardetto1, A. Fokin2, P. Fouqu´e3, J. Storm4, W. Gieren5, G. Pietrzy´nski5,6, D. Mourard1 and P. Kervella7 1Laboratoire Fizeau, UNS/OCA/CNRS UMR6525, Parc Valrose, 06108 Nice Cedex 2, France 2Institute of Astronomy of the Russian Academy of Sciences, 48 Pjatnitskaya Str., Moscow 109017 Russia 3Observatoire Midi-Pyr´en´ees, Laboratoire d’Astrophysique, UMR 5572, Universit´ePaul Sabatier – Toulouse 3, 14 avenue Edouard Belin, 31400 Toulouse, France 4Leibniz-Institut f¨ur Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany 5Departamento de Astronom´ıa, Universidad de Concepci´on, Casilla 160-C, Concepci´on, Chile 6Warsaw University Observatory, Al. Ujazdowskie 4, 00-478, Warsaw, Poland 7LESIA, Observatoire de Paris, CNRSUMR8109, UPMC, Universit´eParis Diderot, 5 place Jules Janssen, 92195 Meudon, France Context: Recent observations of LMC Cepheids bring new constraints on the slope of the period-projection factor relation (hereafter Pp relation) that is currently used in the Baade–Wesselink (hereafter BW) method of distance de- termination. The discrepancy between observations and theoretical analysis is particularly significant for short period Cepheids. Aims: We investigate three physical effects that might possibly explain this discrepancy: (1) the spectroscopic S/N that is systematically lower for LMC Cepheids (around 10) compared to Galactic ones (up to 300), (2) the im- pact of the metallicity on the dynamical structure of LMC Cepheids, and (3) the combination of infrared photome- try/interferometry with optical spectroscopy. Methods: To study the S/N we use a very simple toy model of Cepheids. The impact of metallicity on the projection factor is based on the hydrodynamical model of δ Cep already described in previous studies. This model is also used to derive the position of the optical versus infrared photospheric layers. Results: We find no significant effect of S/N, metallicity, and optical-versus-infrared observations on the Pp relation. Conclusions: The Pp relation of Cepheids in the LMC does not differ from the Galactic relation. This allows its universal application to determine distances to extragalactic Cepheids via BW analysis. Accepted for publication in A&A Available from arXiv:1109.6763 The VLT-FLAMES survey of massive stars: Nitrogen abundances for Be-type stars in the Magellanic Clouds P.R. Dunstall1, I. Brott2, P.L. Dufton1, D.J. Lennon4, C.J. Evans3, S.J. Smartt1 and I. Hunter1 1Department of Physics & Astronomy, The Queen’s University of Belfast, BT7 1NN, Northern Ireland, UK 2University of Vienna, Department of Astronomy, T¨urkenschanzstr. 17, A-1180, Vienna, Austria 3UK Astronomy Technology Centre, Royal Observatory Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK 4ESA, Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA We compare the predictions of evolutionary models for early-type stars with atmospheric parameters, projected rota- tional velocities and nitrogen abundances estimated for a sample of Be-type stars. Our targets are located in 4 fields centred on the Large Magellanic Cloud cluster: NGC 2004 and the N 11 region as well as the Small Magellanic Cloud clusters: NGC 330 and NGC 346. Atmospheric parameters and photospheric abundances have been determined using the non-LTE atmosphere code tlusty. Effective temperature estimates were deduced using three different method- ologies depending on the spectral features observed; in general they were found to yield consistent estimates. Gravities were deduced from Balmer line profiles and microturbulences from the Si iii spectrum. Additionally the contributions of continuum emission from circumstellar discs were estimated. Given its importance in constraining stellar evolution- ary models, nitrogen abundances (or upper limits) were deduced for all the stars analysed. Our nitrogen abundances are inconsistent with those predicted for targets spending most of their main sequence life rotating near to the critical velocity. This is consistent with the results we obtain from modelling the inferred rotational velocity distribution of our sample and of other investigators. We consider a number of possibilities to explain the nitrogen abundances and rotational velocities of our Be-type sample. Accepted for publication in Astronomy & Astrophysics Available from arXiv:1109.6661 4 Non-standard grain properties, dark gas reservoir, and extended submillimeter excess, probed by Herschel in the Large Magellanic Cloud Fr´ed´eric Galliano1, Sacha Hony1, Jean-Philippe Bernard2, Caroline Bot3, Suzanne C. Madden1, Julia Roman-Duval4, Maud Galametz5, Aigen Li6, Margaret Meixner4, Charles W. Engelbracht7, Vianney Lebouteiller1, Karl Misselt7, Edward Montiel7, Pasquale Panuzzo1,
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